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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Chicago

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
20130.140 ppb53ND - 0.300 ppb
20140.200 ppb1412ND - 0.300 ppb
20150.200 ppb64ND - 0.300 ppb
2016ND20ND
2017ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-10SA20328-01_02ND
2012-01-10SA20333-01_02ND
2013-01-08SA30177-01_02ND
2013-01-08SA30176-01_02ND
2013-10-2329178760.200 ppb
2013-10-2329178740.200 ppb
2013-10-2329178780.300 ppb
2014-02-11SB40289-01_02ND
2014-02-11SB40288-01_02ND
2014-04-2830157410.200 ppb
2014-04-2830157570.200 ppb
2014-04-2830157180.200 ppb
2014-04-2830157080.200 ppb
2014-08-1330817260.200 ppb
2014-08-1330817460.200 ppb
2014-08-1330817340.200 ppb
2014-08-1330817490.200 ppb
2014-10-0731189880.300 ppb
2014-10-0731189730.300 ppb
2014-10-0731189770.300 ppb
2014-10-0731189920.300 ppb
2015-01-12SA50260-01_02ND
2015-01-12SA50259-01_02ND
2015-01-1331695380.300 ppb
2015-01-1331693810.300 ppb
2015-01-1331695340.300 ppb
2015-01-1331694010.300 ppb
2016-01-2616A0568-01_02ND
2016-01-2616A0570-01_02ND
2017-01-3017A0785-01_02ND
2017-01-3017B0033-01_02ND